Take-home pay calculator
Gross to net for any pay period: PAYE, ACC, student loan and KiwiSaver, using official rates.
Free
New Zealand calculators
These calculators handle the money and measurement questions that come up in New Zealand: how much GST is in a price, what a pay rise means after tax, how KiwiSaver contributions add up, or how to split the power bill fairly. They all run in your browser, so nothing you enter is sent anywhere.
The calculators
Each card opens a calculator; ones marked "coming soon" are still being checked against official sources.
KiwiSaver calculator
Your contributions, your employer's and the government's, plus an illustrative projection.
FreeGST calculator
Add or remove 15% GST, with line items and exact cents.
FreeFlatmate rent and bills splitter
Split rent and shared bills by room, income or days present, to the cent.
FreeUnit converter
Length, area, mass, volume, temperature, speed and fuel economy.
Free
Where the rates come from
Every rate and threshold these calculators use is read from Inland Revenue's or another government agency's own pages, stored once with its source and the date it was checked, and shown on each page. Pay figures are for the 2026-27 tax year, which runs from 1 April 2026 to 31 March 2027. GST figures were last checked on 2 October 2026. When a new tax year starts, its rates are added as a separate set, so you always know which year a result belongs to.
A calculator only goes live once its figures have been checked against an official page. If a rule can't be confirmed, the feature that depends on it waits rather than guessing. That is why some cards above still say "coming soon".
Which one for which job?
Pricing a job or checking an invoice: the GST calculator, which works in both directions and handles several lines at once. Comparing job offers or checking a pay slip: the take-home pay calculator, which shows every deduction per pay period. Thinking about retirement savings: the KiwiSaver calculator, which separates what you, your employer and the government put in. Sharing a house: the rent and bills splitter, which makes sure the shares add up to the bill exactly. Following an old recipe or a DIY plan in feet and inches: the unit converter.
Estimates, not advice
Results are estimates for general information. Real pay slips can differ because of tailored tax codes, one-off payments, or an employer's payroll rounding. Each calculator explains why its answer might not match yours, and links to the official source so you can check. For decisions about your own tax or KiwiSaver, talk to Inland Revenue, your provider or a qualified adviser.
Learn the rules behind the numbers
If you want to understand the tax as well as get an answer, the guides explain how GST, PAYE, tax codes and KiwiSaver work, with examples. For sharing a house, see splitting rent and bills. A GST-registered business that charges $60,000 or more a year will find the GST guide especially useful.
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